US9188559B2ActiveUtilityA1

Test method and testing device for nozzles and nozzle

41
Assignee: SPEIER JUERGENPriority: Apr 12, 2011Filed: Apr 4, 2012Granted: Nov 17, 2015
Est. expiryApr 12, 2031(~4.8 yrs left)· nominal 20-yr term from priority
Inventors:Juergen Speier
G01N 25/72
41
PatentIndex Score
0
Cited by
11
References
26
Claims

Abstract

The invention relates to a test method for nozzles composed of ceramic or ceramic-like materials, in which the following method steps are carried out: transfer of ultrasonic vibration to the nozzle by means of a sonotrode placed against the nozzle and thermographic evaluation of the heat evolved in a wall of the nozzle.

Claims

exact text as granted — not AI-modified
The invention claimed is: 
     
       1. A test method for nozzles comprising the following steps:
 transfer of ultrasonic vibration to said nozzle by means of a sonotrode placed against a connecting region or a chamber region of said nozzle at a point of contact; 
 application of a force for pressing said sonotrode against said nozzle during the transfer of ultrasonic vibration; 
 use of at least one counterbrace for the purpose of absorbing said pressing force, said counterbrace being placed against only two points of contact on said nozzle, the point of contact of said sonotrode and the two points of contact of said counterbrace forming the corners of a symmetrical planar triangle; and 
 thermographic evaluation of the heat evolved in a wall of said nozzle. 
 
     
     
       2. The test method as defined in  claim 1 , wherein said sonotrode is placed against said connecting region of said nozzle. 
     
     
       3. The test method as defined in  claim 2 , wherein said sonotrode is placed against a peripheral surface of said connecting region. 
     
     
       4. The test method as defined in  claim 1 , wherein said sonotrode is placed against a flat surface in the connecting region or chamber region of said nozzle. 
     
     
       5. The test method as defined in  claim 1 , wherein said sonotrode is placed against an external or internal surface of a wall in the chamber region of said nozzle. 
     
     
       6. The test method as defined in  claim 5 , wherein said counterbrace is placed against the internal or external surface of said wall at a location opposite to said sonotrode. 
     
     
       7. The test method as defined in  claim 1 , wherein a resilient intermediate component is disposed between said sonotrode and said nozzle. 
     
     
       8. The test method as defined in  claim 7 , wherein said intermediate component has a modulus of elasticity which ranges from 9,000 N/mm 2  to 19,000 N/mm 2 . 
     
     
       9. The test method as defined in  claim 8 , wherein said intermediate component has a thermal conductivity ranging from 0.1 W/mK to 0.2 W/mK. 
     
     
       10. The test method as defined in  claim 8 , wherein said modulus of elasticity is 14,000 N/mm 2 . 
     
     
       11. The test method as defined in  claim 1 , wherein at least one heat reflecting mirror is disposed in the region of said nozzle and the thermographic evaluation comprises evaluating a mirror image of said nozzle. 
     
     
       12. The test method as defined in  claim 11 , wherein said heat reflecting mirror is a curved or bent mirror. 
     
     
       13. The test method as defined in  claim 11 , wherein the test method further comprises movement of said mirror and/or a thermal imaging camera during said thermographic evaluation. 
     
     
       14. The test method as defined in  claim 1 , wherein the transfer of ultrasonic vibration is at a frequency of about 20 kHz. 
     
     
       15. The test method as defined in  claim 1 , wherein the transfer of ultrasonic vibration is at a power level which ranges from 100 W to 200 W. 
     
     
       16. The test method as defined in  claim 15 , wherein said power level is 150 W. 
     
     
       17. The test method as defined in  claim 1 , further comprising the application of a mark to said nozzle prior to said thermographic evaluation using a heat-reflecting coating material or by means of a heat source. 
     
     
       18. The method of  claim 1 , wherein the nozzle is of a durable material having a thermal conductivity less than that of metal. 
     
     
       19. The method of  claim 18 , wherein the material is a ceramic material. 
     
     
       20. A testing device for a nozzle, comprising at least one sonotrode for the purpose of transferring ultrasonic vibration to said nozzle, at least one thermal imaging camera for thermographic evaluation of the heat evolved in a wall of said nozzle, and at least one counterbrace placed against a connection region or a chamber region of the nozzle at a location opposite to said sonotrode, the counterbrace resting against only two points of contact on said nozzle, wherein said two points of contact form, together with a point of contact of said nozzle with said sonotrode, a symmetrical planar triangle. 
     
     
       21. The testing device as defined in  claim 20 , further comprising heat-reflecting mirrors, wherein a mirror image of said nozzle is evaluated by use of said thermal imaging camera. 
     
     
       22. The testing device as defined in  claim 20 , further comprising a disk composed of resilient material having a modulus of elasticity ranging from 9,000 N/mm 2  to 19,000 N/mm 2 , disposed between said sonotrode and said nozzle. 
     
     
       23. The testing device as defined in  claim 22 , wherein said modulus of elasticity is 14,000 N/mm 2 . 
     
     
       24. A method for testing nozzles, the method comprising the steps of:
 providing a testing device comprising a sonotrode and a counterbrace; 
 providing a thermographic measuring device; 
 providing a nozzle to be tested for defects, the nozzle being comprised of a material that is durable and has a thermal conductivity less than that of metal, the nozzle having a cavity therein; 
 placing the sonotrode in contact with the nozzle and placing the counterbrace against the nozzle at only two points of contact, which two points of contact together with the sonotrode contact with the nozzle form the corners of a symmetrical planar triangle, the counterbrace being spaced apart from the sonotrode; 
 energizing the sonotrode such that it provides ultrasonic vibration to the nozzle; and 
 using the thermographic measuring device to evaluate the amount of heat evolved from a wall of the nozzle to determine whether the nozzle has a defect. 
 
     
     
       25. The method of  claim 24 , wherein the sonotrode is placed against a connecting region or a chamber region of the nozzle. 
     
     
       26. The method of  claim 24 , wherein the counterbrace is placed against a connecting region or a chamber region of the nozzle.

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